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2. Check your grip (is it too weak?)
3. Take a shorter backswing (for more control)
4. Put the ball more forward in your stance. (I have a wide stance with my diver, toes pointed out, and I put the ball on the heel of my front foot at address).
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Three years ago I went from an 18 hcp to a 12 when a well spent $100 got me 3 lessons with a very good teacher. A big impact was the driver lesson. My drives went from 240 yard slices to 290+ and straight.
Some of the major things he corrected included the three things I quoted above.
Two other items from him that were very helpful included: Addressing the ball with a slightly closed clubface
And impacting the ball at a different angle. Also included in this image is moving the ball forward in the stance and teeeing it up higher.
To change the impact angle, there were a number of things he said, but the one that stuck was to imagine hitting fly balls to a center fielder. Just give your shoulders a slight tilt at address and aim high!
Worked great for me and now I can almost outdrive BadBoyBenny. That dude is deceptively long...
Just my $.02...